Film · 1942 · Animation
The story of a young deer growing up in the forest.

In standard Spanish 'alterado' means agitated or upset, but in this episode's informal woodland-world register it is used to describe animals (and by extension people) who have fallen under the spell of romantic attraction in spring. The meaning of helpless romantic enchantment is not derivable from 'upset' or 'disturbed'.
Literally a boxing term meaning 'to knock out of the fight', used here figuratively to describe the overwhelming effect of falling in love. The sporting origin is transparent, but the figurative romantic application in everyday speech is idiomatic and worth noting.
A fixed idiomatic phrase describing dizziness caused by emotion, not literal spinning. In the episode it describes the disorienting physical sensation of falling in love.